Problem
Body mass index (BMI) is weight in kilograms divided by the square of height in meters.
Implement body_mass_index(weight_kg, height_m).
Input
weight_kg: Weight in kilograms. height_m: Height in meters.
Output
Return weight_kg / (height_m × height_m).
Constraints
1 ≤ weight_kg ≤ 500; 0.5 ≤ height_m ≤ 2.5
Examples
Example 1
Input:
height_m = 1.8
weight_kg = 72.0
Expected output:
expected = 22.222222Input:
double height_m = 1.8;
double weight_kg = 72.0;
Expected output:
double expected = 22.222222;Input:
double height_m = 1.8;
double weight_kg = 72.0;
Expected output:
double expected = 22.222222;Explanation
1.8 × 1.8 = 3.24 and 72 / 3.24 ≈ 22.2222.
Example 2
Input:
height_m = 1.0
weight_kg = 50.0
Expected output:
expected = 50.0Input:
double height_m = 1.0;
double weight_kg = 50.0;
Expected output:
double expected = 50.0;Input:
double height_m = 1.0;
double weight_kg = 50.0;
Expected output:
double expected = 50.0;Explanation
With a height of 1 meter the BMI equals the weight: 50.
How to approach it
Try on your own first, then open one hint at a time.
Hint 1
BMI compares weight to height squared, so the height term matters twice.
Hint 2
Square the height first or be careful with parentheses when dividing.
Hint 3
Use decimal division, because the answer is usually not an integer.
Expected complexity
O(1) time, O(1) extra space
References
This challenge is adapted for CodeUtility. Follow the statement and constraints above.